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From: Steve Yang <stevex.yang@intel.com>
To: dev@dpdk.org
Cc: beilei.xing@intel.com, stephen@networkplumber.org,
	ferruh.yigit@intel.com, Steve Yang <stevex.yang@intel.com>,
	stable@dpdk.org
Subject: [PATCH v3] net/i40e: fix unintentional integer overflow
Date: Fri, 25 Feb 2022 02:39:47 +0000	[thread overview]
Message-ID: <20220225023947.73045-1-stevex.yang@intel.com> (raw)
In-Reply-To: <20220224011722.3585748-1-stevex.yang@intel.com>

Cast 1 to type uint64_t to avoid overflow.

CID 375812 (#1 of 1):
Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN)
overflow_before_widen: Potentially overflowing expression 1 << 2 * i + 1
with type int (32 bits, signed) is evaluated using 32-bit arithmetic, and
then used in a context that expects an expression of type uint64_t
(64 bits, unsigned).

Coverity issue: 375812
Fixes: 5fec01c35c49 ("net/i40e: support Linux VF to configure IRQ link list")
Cc: stable@dpdk.org

---
v2: update commit message;
v3: use RTE_BIT64() to set bit;

Signed-off-by: Steve Yang <stevex.yang@intel.com>
---
 drivers/net/i40e/i40e_pf.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/i40e/i40e_pf.c b/drivers/net/i40e/i40e_pf.c
index 2435a8a070..15d9ff868f 100644
--- a/drivers/net/i40e/i40e_pf.c
+++ b/drivers/net/i40e/i40e_pf.c
@@ -597,14 +597,14 @@ i40e_pf_config_irq_link_list(struct i40e_pf_vf *vf,
 	tempmap = vvm->rxq_map;
 	for (i = 0; i < sizeof(vvm->rxq_map) * BITS_PER_CHAR; i++) {
 		if (tempmap & 0x1)
-			linklistmap |= (1 << (2 * i));
+			linklistmap |= RTE_BIT64(2 * i);
 		tempmap >>= 1;
 	}
 
 	tempmap = vvm->txq_map;
 	for (i = 0; i < sizeof(vvm->txq_map) * BITS_PER_CHAR; i++) {
 		if (tempmap & 0x1)
-			linklistmap |= (1 << (2 * i + 1));
+			linklistmap |= RTE_BIT64(2 * i + 1);
 		tempmap >>= 1;
 	}
 
-- 
2.27.0


  parent reply	other threads:[~2022-02-25  2:47 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-23  6:41 [PATCH v1] net/i40e: fix coverity issue Steve Yang
2022-02-23 10:28 ` Ferruh Yigit
2022-02-24  1:17 ` [PATCH v2] net/i40e: fix unintentional integer overflow Steve Yang
2022-02-24  3:25   ` Zhang, Qi Z
2022-02-24  4:10   ` Stephen Hemminger
2022-02-24  6:21     ` Yang, SteveX
2022-02-24 11:42       ` Ferruh Yigit
2022-02-25  2:39   ` Steve Yang [this message]
2022-02-25 14:48     ` [PATCH v3] " Ferruh Yigit

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